I changed the fluid because I wanted to be running a superior fluid compared to what was put in from the factory. That being said when I drained the factory gear oil with under 2k on the odo it already smelled burnt but obviously there was no color change since it was hardly used but just based on the smell of the gear oil you can often tell how hard it is being worked and how well it is holding up to the stress inside the diff itself.
Pros: superior fluid, factory fluid inferior
Cons: factory gear oil smelled burnt
Vehicle:
Volkswagen Golf
Mileage: 2000 km
